This does not take into consideration the type or size of horizontal reflectors, of even if there is a need for them. I would have expected to have some tuning problems on other bands with this length, maybe, but not at 38004000 khz. Long yagis are commonly used from the 144mhz amateur band to the 2. An antenna such as a dipole can be fed with open wire or ladder line similar to the familiar 300 ohm tv antenna lead in wire with good efficiency, as the feed line loss is less at high swr. Cebik, w4rnl 1434 high mesa drive knoxville, tn 379384443 email.
Running a bare wire from the antenna back to your shack is out of the question. The allband doublet is actually an antenna system and not just an antenna alone. This tuner is made for a random length wire antenna, and it works. The antenna proper is about 47 feet, made of two 24 lengths of hook up wire soldered together with a few inches used for insulators etc. The allband doublet horizontal wire antenna has a history almost as long as amateur radio itself. Buckmaster ocf dipole antennas buckmasters best coaxial cables antenna support rope antenna wire stringliner reel with 270 feet of twisted nylon line harken stainless steel pulleys linegrips rf chokes cq magazine archives great circle azimuthal equidistant maps world prefix and worked all states was maps hamcall mousepads custom name. Antenna design calculators category is a curation of 83 web resources on, parallel square conductor transmission line calculator, analysis of antenna mast strength and bending stress, full wave loop antenna calculator. Jul 14, 2014 hence here is the double biquad antenna and biquad antenna calculators for handmade antenna based on average data.
This spread sheet was made by w4tme for the icom ah4 tuner. To get started on hf i installed a long wire antenna and an icom ah4 tuner. Quad antenna is a type of directional wire radio antenna mainly used on the vhf and uhf bands. The almost random wire antenna kb6nus ham radio blog. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. Wire antenna calculator amateur radio station ws6x. Anchor each wire to eyebolt, feed eyebolt thru pvc pipe and copper strip and.
Cut top wire the 40 meter dipole into 2 pieces 33 ft long, cut second wire the 20 meter dipole into 2 pieces 18 ft long, then cut the third for 10 meters into 2 pieces 10 ft long. With the view to establish a quick and easy multiband antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9. I have what is left from my initial 2m70cm antenna install in 2012. At first i thought it was coming from my pcmonitor, but ruled that out. That dipole may be cut to length on a specific frequency or it may be however long you can make it, but its still a dipole, not an endfed wire. It allows to quickly calculate dimensions for quads antennas, yagi antenna, inverted vees antennas as well as jpoles and traps to extend dipoles band coverage. All you need for a random wire antenna is some wire, your tuner, one or more supports up as high as you can get them to string the wire from the supports to the tuner, at least one or two insulators and a little time. The measurements below are for building a simple dipole antenna. Despite all the words and diagrams in handbooks over the years, newcomers still send me questions about the antenna. Antenna calculator dipole antenna calculator, yagi antenna calculator. Antenna efficiency calculator antenna efficiency calculator, parabola antenna antenna eirp calculator enter power, antenna type, frequency, coax type, coax lenght, press for eirp antenna gain vs height this calculator computes the gain and elevation angles for various antennas that are mounted over a perfect or lossy ground. The correct lengths for the various models will be displayed in the chart. However, my wire wasnt working so well because it wasnt high enough.
Hf dipole antenna this antenna software will help you design a simple wire dipole antennas for 1 30 mhz. Sep 22, 2000 right now, i have about 25 of wire on each side of the ah4 tuner, with the tuner and wire laying on the groundbushes outside of my shack. If you have no particular preference within a given ham radio band, then simply enter its center frequency i. Here is a simple antenna calculator for two popular forms of ham radio hf wire antennas. The following program will calculate the lengths needed to construct several popular wire antennas. Everything antenna amateur base hf wire antennas main. Wire antenna software free antenna modeling software. The ah4 is is well earthed and uses a shielded multicore cable to connect to the radio in the shack. Still, you must manually tune the system each time that you change bands. However i highly recommend to follow my instructions, which are based on computer antenna simulation software 4nec2, to maximize performance.
If it isnt endfed, then its usually nearcenter fed and becomes a dipole antenna instead. Antenna calculator dipole antenna calculator, yagi antenna calculator, find the length of a dipole, 3 element yagi. Helical antennas invented by john kraus give a circular polarized wave. Not like a beam, and i work mostly cw, but its a good antenna, and because it is a wire antenna, if it doesnt perform to your desires, you arent out a lot of money or time and effort. However i highly recommend to follow my instructions, which are based on computer antenna simulation software 4nec2. Analysis of thinwire structures in the presence of finite ground. It was written for dos many years ago and ported to windows. The random wire antenna is probably one of the least expensive, easiest and cheapest hf antennas to use if you have a tuner and you want to get the most out of a length of random wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes. Antenna theory is antenna theory so this will work for any antenna tuner.
This calculator will help you to calculate the different wavelength of antennas based on the frequency. The main category is antenna design calculators that is about antenna design calculators. This type of feed line must be routed away from conductive objects, and cannot be. The formula for calculating the approximate length of a quarterwave vertical antenna is. A simple, nearly invisible, multiband wire antenna with reasonable gain, low angle of radiation. Use the attached excel spreadsheet to calculate what lengths to avoid when puting up a long wire. Enter the desired frequency and select the desired calculation from the drop box.
The tuner brought in 80m, 40m, 30m, 20m, 21m, at swr 1. I have collected the questions and boiled them down to 10, all of which have many variations. Buy an icom ah4 end fed tuner auto coupler, attach your wire antenna wire to the hot end and run a short wire from ground side to a ground rod or counterpoise wire and enjoy. The horizontal centerfed wire forms the antenna proper, which accounts for the radiation of transmitted energy and the reception of incoming energy. This is a simple wire multiband antenna that can be fed with either coax or ladderline and can be made to operate well from 160 to 10meters with an antenna tuner. The antenna is basically a quad opened up on the bottom. Mainly because of the large metal roofed building next to my antenna setup. We offer a variety of multiband and allband dipoles that provide great receiving performance with low swr. I have used ah4 tuners with my icom rigs for many years. Antenna calculator wifi antenna extension loss calculator. This link is listed in our web site directory since thursday nov 16 2017, and till today wire antenna calculator has been followed for a total of 1140. Run the counterpoise in any direction you want, but make sure it is at least 5% longer. So my offering to fdim 9 will also be a matter of 5.
Find a tube with a circumference equal to one wavelength, and wrap wire in a helix spaced a quarter wavelength. Hence here is the double biquad antenna and biquad antenna calculators for handmade antenna based on average data. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. This app does nothing more than the standard 468freq mhz type calculations. Antenna design freeware 1d and 2d arrays from mei software. For tuning to get more bands, as an experiment, i simply wrapped up 5 or 10 or 15 feet of the end in a tight loop, wrapped tape around it, and let it dangle. All you need to do is enter the desired resonant center frequency in the form below, then click calculate.
Endfed wire antenna lengths amateur radio stack exchange. Mar 12, 2007 from what ive seen playing with some modeling software, adding some vertical portion to the antenna can slightly ease the cloudburning effect of a relatively low horizontal run on lower frequencies, as well as significantly reduce the depth of the nulls of a long horizontal wire on higher frequencies. This link is listed in our web site directory since thursday nov 16 2017, and till today wire antenna calculator has been followed for a total of 1140 times. The tuner will tune up across all bands, but the noise level is high. Yagi calculator is a windows program that also runs well on linux, ubuntu 8. The antenna acts like a stacked pair on the vertical and a standard yagi on horizontal. Having had a gem quad hf 201510m for a few years, back in the early 80s, i can testify to the quads slight advantages over a tribander yagi with the same number of elements. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Feeding the antenna can be done at the director or at the reflector. Use this online calculator to determine the length of a fullwave loop antenna from the frequency. This calculator is designed to give the vertical length height of a particular antenna, for the frequency and wavelength chosen. Random wire antennas best lengths to use for random wire. Wire antennas, buy new and used products from ham radio. I hooked up one side of the ladder line to the post for the single wire that it was made for.
The dl6wu yagi is highly regarded as being easy to build with repeatable results, broad bandwidth and a useful pattern. Program good for 1 500 mhz, although intended for mf hf useage. See more ideas about ham radio antenna, ham radio and dipole antenna. Quarterwave matching section lengths are also calculated.
Antenna, ve3sqb ham radio antenna design software programs. Quad antenna design is one more free antenna design and analysis software for windows. A very basic program for calculating the length of each leg of a 12 wave wire dipole antenna. To be combined with a yagi uda antenna or used as is. The antenna acts like a stacked pair on the vertical and a. About wire antenna calculator the resource is currently listed in in a single category.
From what ive seen playing with some modeling software, adding some vertical portion to the antenna can slightly ease the cloudburning effect of a relatively low horizontal run on lower frequencies, as well as significantly reduce the depth of the nulls of a long horizontal wire on higher frequencies. This formula to obtain the length of a halfwave dipole antenna will give a good ballpark value to start with. A quarterwavelength antenna is easy and inexpensive to build and can be an effective antenna with a low angle of radiation that is, power is radiated out, not up. Design and adjustement is easy, as with the capacitor you can tune the resonance by some mhz with no effort. Also for many years i have hated dealing with the installation of them for fixed or portable operation, so i finally broke down and benched the tuner and started making it more friendly towards to use. I finally decided to put the ah4 into service and get an hf antenna here. With a ground wire running from the bracket, down the mast and connected to various lengths of wire laying on the pavement, the resonant frequency of the antenna changed slightly 10 kc shift and the swr varied slightly, from 1. The results are conveniently displayed in inches, centimeters, feet and meters. I decided to try the tuner with a zs6bkw antenna, although this is not what it was designed for. Notice the counterpoise running from the ah4 in a circle around the tripod. Antenna calculators folded dipoles, wire antennas, design your own. Spacing is the distance from the boom to the gammamatch. When adjusted slightly for 40m and 20m, the swr can be 1. The conductor width isnt of great importance in the design.
Analysis of thin wire structures in the presence of finite ground. I decided on a wire running from the ah4 up to near the top of a tv type mast where a discone is now mounted, then over to another mast about 25 feet or so away, then down as. The skyhopper was named after the first one was compared to a grasshopper. Shop our selection of alpha delta wire antennas, including multiband sloper antennas for limitedspace applications and swl antennas for superior performance through 30 mhz. Download hf dipole calculator 12 wave wire dipole antenna. This calculator is designed to give the horizontal length of a particular dipole including tees antenna, or one side of it, for the frequency chosen. The distance between one point to another adjacent point in a wave is known as the wavelength. Ver2calwireantenna actuallyaver2callyorientated resonate12wavedipolewith theearthbeingthe return half duetopoorground conduc2vitya. Heres how to get any length of wire over 60 feet long to work any band from 160 to 6 meters. Since the wire is insulated, it probably appears to be a slightly longer wire to the antenna tuner, which is an icom ah4 sitting at foot of the antenna. It provides reliable matching of frequencies from 3. I have about 100 of dx engineering dxe400 max 50ohm coax, about 300 of 18awg stranded wire, and a few miscellaneous coax connectors, terminal lugs. This up and over, over and down design had been used in hf wire antennas.
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